In modern agricultural engineering, selecting the right steel pipe is critical to balancing cost, durability, and structural performance. For greenhouse construction projects in Chile, traditional heavy-wall pipes often lead to unnecessary cost increases without delivering proportional benefits.
This case study explores how a Chilean agricultural contractor successfully reduced project costs by 18% by switching to Schedule 20 galvanized steel pipe, while maintaining structural integrity and improving installation efficiency.
Project Background
Project Location: Central Valley, Chile
Industry: Agriculture / Greenhouse Construction
Project Type: Export-grade fruit greenhouse (grapes & blueberries)
The client is a mid-to-large agricultural EPC contractor responsible for designing and building greenhouse systems for export-oriented farms. Chile's Central Valley has a Mediterranean climate, but greenhouse environments involve high humidity, irrigation exposure, and temperature variation, making corrosion resistance essential.
Customer Pain Points
1. Over-Engineering Cost Problem
The original design used Schedule 40 steel pipes, which significantly increased material costs.
👉 Issue:
Structural load requirements were relatively low
SCH 40 resulted in 15–20% unnecessary cost increase
2. Corrosion Risk in High Humidity
Greenhouse environments involve:
Continuous irrigation
Fertilizer exposure
Humid air circulation
👉 Standard black steel pipes showed visible rust within 6–12 months
3. Installation Efficiency Bottleneck
Heavier pipes = more labor
More welding required
Longer construction timeline
4. Unstable Local Supply
Local suppliers had:
Long lead times (45–60 days)
Limited customization capability
Our Engineering Solution
We proposed a cost-optimized material strategy using:
✔ Schedule 20 Hot Dip Galvanized Steel Pipe
Key Adjustments:
Reduced wall thickness (vs SCH 40)
Maintained sufficient structural strength
Applied hot-dip galvanizing (HDG) for corrosion protection
Technical Specification Table
| Parameter | Specification |
|---|---|
| Product | Schedule 20 Galvanized Steel Pipe |
| Standard | ASTM A53 Grade B |
| Sizes | 1" (DN25), 1.5" (DN40) |
| Outer Diameter | 33.4 mm / 48.3 mm |
| Wall Thickness | 2.65 – 2.77 mm |
| Length | 6 meters |
| Zinc Coating | ≥ 60 μm |
| Surface | Hot Dip Galvanized |
| Quantity | 80 Tons |
Engineering Comparison (SCH 20 vs SCH 40)
| Item | SCH 20 | SCH 40 |
|---|---|---|
| Weight | Lighter (↓20–25%) | Heavier |
| Cost | Lower | Higher |
| Strength | Over-designed | Over-designed |
| Installation | Faster | Slower |
| Application | Light structures | High-pressure systems |
Customized Services Provided
To further improve efficiency, we provided:
Pre-cutting → reduced on-site work
Hole drilling → ready-to-install
Bundle packaging for export
Full MTC (Mill Test Certificate)
Project Execution Timeline
| Stage | Duration |
|---|---|
| Order Confirmation | 3 days |
| Production | 12 days |
| Galvanizing | 5 days |
| Shipping | 20 days |
👉 Total Lead Time: ~40% faster than local suppliers
Final Results & Benefits
💰 Cost Savings
Total saving: USD 120,000+
Material cost reduced by 18%
⚡ Installation Efficiency
Construction time reduced by 30%
Lower labor cost
🛡️ Corrosion Resistance
No visible rust after 2+ years
Suitable for humid agricultural conditions
📦 Supply Chain Improvement
Stable delivery
Repeat order confirmed
Customer Feedback
"Switching to Schedule 20 galvanized steel pipe was a game changer. We reduced cost significantly without compromising performance. The pre-fabrication service also saved us a lot of time on-site."
Why SCH 20 Pipe is Ideal for Greenhouse Projects
Lightweight → easy installation
Cost-effective → optimized ROI
Corrosion resistant → longer lifespan
Flexible processing → adaptable design
FAQ Section
1. What is Schedule 20 galvanized steel pipe used for?
It is mainly used in low-pressure and structural applications such as greenhouse frames, irrigation systems, and fencing.
2. Is SCH 20 strong enough for greenhouse structures?
Yes. For non-load-bearing or light-load structures, SCH 20 provides sufficient strength with lower cost.
3. What is the difference between SCH 20 and SCH 40 pipe?
SCH 20 has a thinner wall, making it lighter and more economical, while SCH 40 is used for higher pressure applications.
4. How long does galvanized pipe last in agriculture?
With proper zinc coating (≥60μm), it can last 10–20 years depending on environment.
Call To Action
Looking for a reliable Schedule 20 Galvanized Steel Pipe supplier for your next project?
✔ Competitive factory price
✔ Custom sizes & processing
✔ Fast delivery worldwide
✔ Full certification support
👉 Contact us now for a free quotation within 12 hours
+8615769214734
office@dongmjd.com
